Extract senders address

Why can't I extract senders address according to these rules in Timo's
procmail tips?
http://lipas.uwasa.fi/~ts/info/proctips.html#replyto


REPLYTO_=`formail -cXReply-To: | head -1 | formail -rtzxTo:`

or

REPLYTO_=`egrep "^Reply-To:" | head -1 \
         | formail -c -rt -xTo: \
         | expand | sed -e 's/^[ ]*//g' -e 's/[ ]*$//g'`

Variable REPLYTO_ is allways foo(_at_)bar

Thanks.
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